杉木与米老排人工混交林群落木本植物空间格局研究
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引用本文:李 宪,廖良宁,杨海鹏,黄永珍,李远发,叶绍明.杉木与米老排人工混交林群落木本植物空间格局研究[J].西北植物学报,2019,39(10):1842~1850
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作者单位
李 宪,廖良宁,杨海鹏,黄永珍,李远发,叶绍明* (广西大学 林学院南宁 530004) 
基金项目:广西科技重大专项(桂科AA17204087 8)
中文摘要:该研究在全面踏查广西大青山实验场杉木 米老排人工混交林群落的基础上,采用典型样方法选择1块90 m × 110 m的永久固定样地,测量每株活立木中心位置坐标,检尺每株活立木胸径 (地径)、树高、冠幅等,并采用径级代替龄级和空间点格局分析方法的Ripleys L(r)函数,分析杉木 米老排人工混交林的种群动态以及群落内主要木本植物种群的空间分布格局和主要种群的种间关联,以探讨杉木 米老排人工混交林群落内物种间的相互作用以及保持种群稳定与演替规律,为亚热带人工混交林培育的树种选择、空间结构调整及抚育管理提供理论依据。结果表明:(1)样地内胸径≥1 cm的活立木共计49个树种、 3 361株,其中杉木、米老排、三桠苦、红椎、九节、对叶榕、水锦树7个树种重要值都在4%以上,占有较大优势,是林分的主要树种。(2)杉木 米老排人工混交林群落内所有活立木(DBH≥1 cm)在0~40 m的尺度上表现出聚集分布,其中:幼树(1 cm≤DBH<5 cm)在0~40 m的尺度上的聚集程度较群落内所有活立木聚集程度高;小树(5 cm≤DBH<10 cm)在0~5 m的尺度上呈现随机分布,在6~40 m尺度上的聚集程度较弱;大树(DBH≥10 cm)在小于5 m的尺度上表现出均匀分布,在5~40 m尺度上服从于随机分布。(3)群落内7个主要种群除米老排和红椎接近随机分布外,其他种群皆服从聚集分布,且随尺度增加聚集程度增强。(4)样地内大树与小树之间相互独立,而小树与幼树、大树与幼树之间在研究尺度范围内存在正关联关系。(5)研究区群落内主要种群(21个种对)之间以无关联和负关联为主,只存在少量种群(5个种对)之间呈正关联,表明广西大青山实验场杉木 米老排人工混交林群落结构的稳定性较弱,尚未达到群落演替的顶级阶段。
中文关键词:杉木  米老排  人工混交林  种间关联  空间格局
 
Spatial Pattern of Woody Plants in Artificial Mixed Forest of Cunninghamia lanceolata and Mytilaria laosensis
Abstract:On the basis of a comprehensive survey of the artificial mixed forest of Cunninghamia lanceolata and Mytilaria laosensis in the Daqingshan Experimental Field in Guangxi, we selected a typical fixed plot of 90 m × 110 m by a typical method to measure the coordinates of the center of each standing tree. The scale of each plant is measured, includes the diameter, the height and the width of the tree. We analyzed the population dynamics of the mixed forests, the spatial distribution pattern of main woody plant populations and the interspecific association of main populations in order to explore the interactions between species in the artificial mixed forest of C. lanceolata and maintaining population stability and succession by using diameter class replace the age class and the Ripleys L(r) function of spatial point pattern. It provides a theoretical basis for tree species selection, spatial structure adjustment and tending management for subtropical mixed forests. The results showed that: (1) there were 49 species and 3 361 viable standing trees with a breast diameter of ≥1 cm in the plot, including the important values of seven species of C. lanceolata, Mytilaria laosensis, Evodia lepta, Castanopsis hystrix, Psychotria rubra, Ficus hispida, and Wendlandia uvariifolia. Of all are above 4%, which has a large advantage and is the main tree species of the forest. (2) All living stands (DBH≥1 cm) in the mixed forest of C. lancenlata and M. laosensis showed clustering distribution on the scale of 0-40 m, among which: saplings (1 cm≤DBH<5 cm) were on the scale of 0-40 m. The degree of aggregation is higher than that of all living trees in the community. Small trees (5 cm≤DBH<10 cm) are randomly distributed on the scale of 0-5 m, and the degree of aggregation is weak on the scale of 6-40 m, while large tree (DBH≥10 cm) exhibits a uniform distribution on a scale of less than 5 m and a random distribution on a scale of 5 to 40 m. (3) In addition to the random distribution of the seven old populations in the community, except for the M. laosensis and C. hystrix, the other populations are subject to aggregate distribution, and the degree of aggregation increases with the scale. (4) The large trees and the small trees in the plot are independent of each other, and there is a positive correlation between the small trees and the saplings, the large trees and the saplings in the research scale. (5) There is no correlation or negative correlation among the main populations (21 species pairs) in the study area, and only a small number of populations (5 pairs) are positively correlated, indicating that the stability of the structure of the artificial mixed forest of C. lanceolata and M. laosensis in the Daqingshan experimental field in Guangxi is weak, and it has not reached the top stage of community succession.
keywords:Cunninghamia lanceolata  Mytilaria laosensis  artificial mixed forest  intraspecific association  spatial pattern
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